Continuous time-resolved spectroscopy of the AM Herculis binary 0139 - 68

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Stellar Spectra, White Dwarf Stars, X Ray Sources, Stellar Mass, Stellar Mass Accretion, Stellar Orbits

Scientific paper

Results of single-trailed spectrograms of the magnetic accreting white-dwarf binary 0139 - 68 are presented. The spectral resolution is approximately 2.5 A and the time resolution is 45 seconds. Line-profile changes and radial velocities are derived and described. A discussion of possible orbital velocities indicates probable masses of 0.2-0.6 solar mass for the white-dwarf primary and 0.3 solar mass for the M-star secondary. The position of the active pole is suggested. The origin of the high-velocity line components is not clear, but their behavior is similar to those in the system VV Pup.

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